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Calculate the mass of FeS formed when 9.42 g of iron metal reacts with 8.50 g of sulfur according to the following reaction.
63.0 mL of a 1.20 M solution is diluted to a total volume of 218 mL. A 109-mL portion of that solution is diluted by adding 139 mL of water. What is the final concentration?
A 50.0-L stainless steel container was charged with 3.00 atm of hydrogen gas and 4.00 atm of oxygen gas. A spark ignited the mixture, producing water.
The acceleration of a certain simple harmonic oscillator is given by a = -(15.8 m/s2) cos (2.51t). What is the amplitude of the simple harmonic motion?
What weight of A would be removed by four successive extractions with 25-mL portions of ligroin? how much ligroin would be required to remove 98.5% of A in a single extraction?
Sketch the energy band diagram from gate of MOSFET through the channel to the substrate at points at points where Vgs>Vth and Vds=Vgs-Vth
When the building is unheated, the inside temperature falls to 0.0°C, and heat conduction ceases. However, the wall does emit radiant energy when its temperature is 0.0°C. The radiant energy
An aqueous solution contains o.180g of an unknown, nonionic solute in 50.0g of water. The solution freezes at -0.1079 degrees Celsius. What is the molar mass of the solute?
What were the weights of the two 25.00 mL samples? Do these data support the manufacturer's specification that the pipet delivers 25.00 ± 0.03 mL?
Determine how many moles of Ba(OH) 2 are required to completely neutralize 0.110 mole of HC 2 H 3 O 2 ?
A dentist's drill starts from rest. After 3.20 s of constant angular acceleration, it turns at a rate of 2.46 104 rev/min. Find the drill's angular acceleration.
The coast gurard wishes to send a speedboat to intercept and investigate the vessel. b) find the time required for the cutter to intercept the ship.
An aqueous potassium nitrate solution has a freezing point of -2.0 .C. How many moles of potassium nitrate are contained in 0.5 kg of water in this solution? The freezing point depression constant f
2 NO(g) + O2(g) 2 NO2(g) In one experiment 0.633 mole of NO is mixed with 0.354 mole of O2. Calculate also the number of moles of NO2 produced.
Concentrated NaOH is 12 M and has a density of 1.53 g/mL. What is the percent NaOH by mass of concentrated NaOH?
What is the molar mass of a nonelectrolyte if 6.02 grams dissolved in 30.0 grams of benzene freezes at -1.55 .C? The freezing point of pure benzene is 5.50 .C and the freezing point depression const
Even though the carbonyl and amine are connected by a single bond, there is essentially no rotation around this bond, why is that? Can the amine group of the peptide bond function as a nucleophile?
What quantity of ethylene glycol, HOCH2CH2OH, must be added to 50 grams of water to raise the boiling point by 1.0 C? Express this answer in grams.
How much energy (in calories) is needed to heat 10cm^3 of fat from room temperature (25 C) to its melting point (35 C)?
What is the boiling point of a mixture composed of 85 g HOCH2CH2OH (ethylene glycol) and 125 g H2O? The boiling point elevation constant for H2O is 0.512 .C/m.
Sea water has a sodium (Na+) concentration of 1.08 x 104 ppm. If the solution is present as dissolved NaCl, what mass of NaCl is in each liter of sea water? Seawater has a density of 1.05 g/mL.
Calculate the mass of propylene glycol that must be added to 0.330 of water to reduce the vapor pressure by 2.88 torr at 40°C.
A mass of 0.750 g calcium chloride is diluted with 975 g H2O. What is the chloride ion concentration (in ppm)?
Four objects are held in position by massless rigid rods. the masses are: 10 kg, 1.21 kg, 1.61 kg, 25.65 kg. Determine the moment of inertia for through the origin at the center of the rectangular
The vapor pressure of pure water at 50.0 .C is 92.5 mm Hg. Calculate the ideal partial pressure of water at this temperature for a mixture of 45.0 g H2O and 55.0 g CH3OH?